The online attacks took place on Monday, with Israeli media saying that several websites, including those of the Ministry of Education and the Airports Authority, had been hacked.

Anonymous had said in a statement on Sunday, “On April 7, 2014, we call upon our brothers and sisters to hack, deface, hijack, database leak, admin takeover, and DNS terminate the Israeli Cyberspace by any means necessary.”

Addressing the Israeli regime, Anonymous also said that “further assault on the people of Gaza, who have been flooded by your sewage, terrorized by your military apparatus, and left to die at the border while waiting for medical attention will NOT be tolerated anymore.”

The group, that was referring to the Israeli siege on Gaza in place since 2007, pledged not to stop until “Palestine is free.”

The group’s first cyber attack against Israel was launched during Tel Aviv’s assault on Gaza in November 2012. Some 700 websites, including Foreign Ministry and the Israeli president’s official websites, were hacked at the time and the personal data of some 5,000 Israeli officials were posted online.

Anonymous also carried out similar attacks on April 7, 2013, when the websites of the Israeli parliament, ministries and other government organizations stopped functioning for some time.